General-purpose solid-state relays are used to control large resistance heaters in conjunction with temperature controllers. This CE compliant, solid-state relay with LED operation indicator is capable of millions of hours of operation and has a built-in varistor to absorb external surges. The G3NA SSR is available for both ac and dc loads and control voltages, in current ratings up to 50 A. Ideal for the chemical, plastics and food industry.